Franz prokupek



P. PROKUPEK. FUNNEL FOR DUST COLLECTORS.

(No Mqdel.)

' No. 575,934. Patented Jan. 26,1897.

7 INVENTOH;

WITNESSES.

11v: mums rm'zns co, Pnoroumn. WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

FRANZ PROKUPEK, O F MILAN, ITALY.

FUNNEL FOR DUST-COLLECTORS.

SPECIFICATION forming part of Letters Patent No. 575,934, dated January 26, 1897.

Application filed September 3, 1896. Serial No. 604,727. (No model.) Patented inltaly January 18, 1894, No, 35,444; in 8witzerland. January 25, 1894, No. 8,249; in England January 27, 1894, No. 1,852; in Germany March 18, 1894, No. 78,771; in France April 16,1894,l\lo.235,799; in Austria September 4, 1894.110, 3,280, and in Hungary 8eptember 4,

l894,l lo.36,996.

To all whom, it may concern.-

Be it known that I, FRANZ PROKUPEK, a subject of the Emperor of Austria and King of Hungary, and a resident of Milan, in the Kingdom of Italy, have invented certain new and useful Improvements in Funnels for Dust Collectors, (for which I have obtained Letters Patent in Great Britain, dated J anuary 27, 1894, No. 1,852; in Switzerland, dated January 25, 1894, No. 8,249; in Germany, dated March 13, 1894, No. 78,771; in France, dated April 16, 1894, No. 235,799; in Austria, dated September 4, 1894, No. 3,230; in Hungary, dated September 4,1894, No. 36,996, and in Italy, dated Januar 18, 1894, No. 35,444,) of which invention the following is a specification.

This invention relates to an improved f unnel for dust-collectors.

"The dust-collectors heretofore employed present the inconvenience that a considerable part of the dust, including mill-dust, is carried away with the air, which, after having passed in its whirling movement along the lateral wall of the cone of the collector, es-. capes therefrom at the upper part. The modifications in the said apparatus devised for the purpose of breaking the current of air in order to obviate this inconvenience have in their turn the defect of causing a great quantity of air to pass into the sacks designed for collecting the dust.

My improved device, adapted to be used for weak as well as for strong currents of air, consists, substantially, of a funnel which may be mounted upon any ordinary dust-collecting apparatus, the lower truncated extremity of which has previously been removed, so that the funnel and collector form only a single apparatus after mounting. This device is not only furnished with means for breaking the current, but also with means by which the orifice provided at the lower part of the apparatus may be regulated. If the sacks attached to the lower part of the funnel are excessively infiated,'too much air is introduced into them and it is necessary to increase the section of the passage at the lower extremity of the cone in order that the air may, as it whirls, rise along the cone and escape at the upper part.

If, on the contrary, the sacks fold up under the action of too energetic an interior suction, it is necessary to contract the orifice provided at the lower end of the cone in order to moderate the back movement of the air from the bottom to the top.

-In the accompanying drawings, Figure 1. shows a vertical section of the lower part of a dust-collecting apparatus provided with the funnel forming the subject of this invention. Fig. 2 is a plan view from above of Fig. 1; and Figs. 3 and 4represent the vanes designed to break the current, as hereinafter set forth.

In the interior of the funnel B, which is fixed to the extremity of the cone of the dustcollectingapparatus A, are also secured vanes (Z d, occupying at their lower part the whole interior diameter 0 of the funnel, with the exception of the central circumference. These vanes cl are cut at the upper part in accordance with the profile of the cone 0, which is riveted upon them and which they hold in such a manner that their radial width is reduced at 70, Fig. 1.

The vanes (Z are represented in plan, Fig. 4, while Fig. 3 shows in elevation the cylindrical helices by which they cut the interior I surface of the cylinder of the funnel B, having a diameter 0, and conical helices by which they cut the truncated cone 0, the diameter of the large base of which is shown at a and that of the small base at f.

The descending current of air, subdivided by the cone 0 a f, will break against the vanes d, (see the arrows, Fig. 3,) and as the intervals a between the vanes offer it a very extended section of passage it allows the total amount of dust which it holds in suspension to pass along the interior wall of the funnel.

It remains to be described how the regulation hereinbefore referred to is effected.

Suppose the wall of the truncated cone 0 a f to be provided interiorly with another cone, the large base of which is seen at 1), formed of very thin and flexible sheet metal and terminatin g exactly as C a f in a circular orifice, whose diameter is f. Now imagine the lateral surface of the flexible cone to slide down ward, while it is kept against the surface of the truncated cone 0 a f in such a manner that the circular orifice f will gradually be contracted. It will be seen that by acting in this manner any intermediate value between the area of the circular orifice f and mi may be obtained for the lower orifice of the passage for the air passing upward. The position of the flexible cone when the orifice is entirely closed is shown in dotted lines in Figs. 1 and 3, where the upper base of the flexible cone will be placed at Z) and the lower base is reduced to a point 71, constituting the apex of the cone, into which the truncated cone represented in full lines is transformed. This gradual regulation is effected by means of a thumb-nutj, the bolt of which is fitted to slide in the interior of a slot 3, provided in the exterior fixed cone 0 CL f, while the head of a rivet 0;, designed to keep the two cones together, is displaced during the regulation along another slot 75, pierced in the side of the flexible interior cone.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that What I claim is V 1. Afunnel for dust-collectors,having vanes capable of breaking the air-current, a fixed truncated cone, a flexible cone, within the fixed cone and capable of being deformed so as to gradually contract or completely obstruct the lower orifice of the fixed truncated cone.

2. A tunnel for dust-collectors, having a shell or body, a plurality of vanes held within the body and breaking the current of air passing through the same, a truncated cone supported on the vanes, and a flexible cone adapted to receive atmospheric pressure, and adjustably held within'the truncated cone, substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

FRANZ PROKUPEK. \Vitnesscs:

G. B. ZANARD, R. KLoIs. 

